DapperCalc

DapperCalc contains various calculations that power DapperBrew. This work is ongoing. Calculations may be incomplete, or incorrect.

TODO

Modules

sg2plato ⇒ number: Convert specific gravity (sg) to plato
plato2sg ⇒ number: Convert plato to specific gravity (sg)
originalExtract ⇒ number: Calculate original extract from original gravity.
apparentExtract ⇒ number: Calculate apparent extract from final gravity.
attenuationCoefficient ⇒ number: Calculate attenuation coefficient from original extract.
realExtract ⇒ number: Calculate real extract from starting gravity & final gravity.
abw ⇒ number: Calculates the Alcohol by weight (ABW)
abv ⇒ number: Calculates the alcohol by volume (abv)
caloriesAlcohol ⇒ number: Calculate number of calories from Alcohol in 12oz serving.
caloriesCarbs ⇒ number: Calculate number of calories from carbs in 12oz serving.
caloriesTotal ⇒ number: Calculate number of calories in 12oz serving.
aAttenuation ⇒ number: Calculate the apparent attenuation
rAttenuation ⇒ number: Calculate the real attenuation
aau ⇒ number: Calculate Alpha Acid Units
utilization ⇒ number: Hop Utilization (Tinseth)
ibu ⇒ number: Calculate IBU for hop addition (Tinseth / pellets)
srm2lovibond ⇒ number: SRM to Lovibond
lovibond2srm ⇒ number: Lovibond to SRM
mcu ⇒ number: Calculate Malt Color Units
srm. ⇒ number: Calculates color (SRM) of eer using standard reference method (Morey equation)
sg2gp ⇒ number: Convert specific gravity (sg) to gravity points.
gp2sg ⇒ number: Convert gravity points to specific gravity (sg)
dilute ⇒ number: Calculate new SG when wort is diluted
adjustWater ⇒ number: Calculate water needed to reach target gravity.
adjustExtract ⇒ number: Calculate how much extract (in lb) is needed to reach target gravity.
evapLossPerHour ⇒ number: Calculate how much volume (gallons) is lost per hour to evaperation
totalBoilLoss ⇒ number: Calculate total volume (gallons) lost during boil to evaperation
shrinkage ⇒ number: Volume lost after wort cools (in gallons)
postBoilVolume ⇒ number: Calculate post boil volume (gallons)
postBoilGravity ⇒ number: Calculate post boil gravity.
estimateOriginalGravity ⇒ number: Estimate Original Gravity
estimateFinalGravity ⇒ number: Estimate Final Gravity Points
estimateFinalGravity ⇒ number: Estimate Final Gravity (adjusted for simple sugars & mash temp)

sg2plato ⇒ `number`

Convert specific gravity (sg) to plato

Returns: number - (-616.868) + (1111.14 x sg) - (630.272 x sg^2) + (135.997 x sg^3)

Param	Type	Description
sg	`number`	the specific gravity (sg)

Example

// returns 21.1
sg2plato(1.088);

plato2sg ⇒ `number`

Convert plato to specific gravity (sg)

Returns: number - plato / (258.6 -((plato / 258.2) x 227.1)) + 1

Param	Type	Description
plato	`number`	plato number to be converted

Example

// returns 1.074
plato2sg(18);

originalExtract ⇒ `number`

Calculate original extract from original gravity.

Returns: number - OE = -668.962 + (1262.45 * OG ) - (776.43 * OG^2) + (182.94 * OG^3)
See: Dr. Michael Hall article, Zymurgy, Summer 1995

Param	Type	Description
og	`number`	original gravity (og)

Example

// returns 21.1
originalExtract(1.088);

apparentExtract ⇒ `number`

Calculate apparent extract from final gravity.

Returns: number - AE = -668.962 + (1262.45 * FG ) - (776.43 * FG^2) + (182.94 * FG^3)
See: Dr. Michael Hall article, Zymurgy, Summer 1995

Param	Type	Description
fg	`number`	final gravity (fg)

Example

// returns 3.07
apparentExtract(1.012);

attenuationCoefficient ⇒ `number`

Calculate attenuation coefficient from original extract.

Returns: number - q = .22 + (.001 * OE)
See: Dr. Michael Hall article, Zymurgy, Summer 1995

Param	Type	Description
oe	`number`	original extract (oe)

Example

// returns 3.07
attenuationCoefficient(21.1);

realExtract ⇒ `number`

Calculate real extract from starting gravity & final gravity.

Returns: number - RE = ((q * OE) + AE) / (1 + q)
See

Dr. Michael Hall article, Zymurgy, Summer 1995
(not currently used) hbd.org/ensmingr

Param	Type	Description
og	`number`	original gravity (og)
fg	`number`	final gravity (fg)

Example

// returns 6.5697
realExtract(1.088, 1.012);

abw ⇒ `number`

Calculates the Alcohol by weight (ABW)

Returns: number - (abv x 0.79336) / fg

Param	Type	Description
og	`number`	The original gravity (og)
fg	`number`	The final gravity (nfg)

Example

// returns 7.23
abw(1.088, 1.019);

abv ⇒ `number`

Calculates the alcohol by volume (abv)

Returns: number - abw * (FG / .749);

Param	Type	Description
og	`number`	original gravity (og)
fg	`number`	final gravity (fg)

Example

// returns 10.2
abv(1.089, 1.012);

caloriesAlcohol ⇒ `number`

Calculate number of calories from Alcohol in 12oz serving.

Returns: number - 1881.22 * fg * ((og - fg) / (1.775 - og))
See: www.homebrewersassociation.org

Param	Type	Description
og	`number`	original gravity (og)
fg	`number`	final gravity (fg)

Example

// returns 210.61
caloriesAlcohol(1.088, 1.012);

caloriesCarbs ⇒ `number`

Calculate number of calories from carbs in 12oz serving.

Returns: number - 3550.0 * fg * ((0.1808 * og) + ((0.8192 * fg) - 1.0004))
See: www.homebrewersassociation.org

Param	Type	Description
og	`number`	original gravity (og)
fg	`number`	final gravity (fg)

Example

// returns 91.04
caloriesCarbs(1.088, 1.012);

caloriesTotal ⇒ `number`

Calculate number of calories in 12oz serving.

Returns: number - calories from alcohol + calories from carbs
See: www.homebrewersassociation.org

Param	Type	Description
og	`number`	original gravity (og)
fg	`number`	final gravity (fg)

Example

// returns 301.65
caloriesTotal(1.088, 1.012);

aAttenuation ⇒ `number`

Calculate the apparent attenuation

Returns: number - 100 x (1 - (°Pf / °Pi))
See: hbd.org/ensmingr

Param	Type	Description
og	`number`	original gravity (og)
fg	`number`	final gravity (fg)

Example

// return 85.3
aAttenuation(1.088, 1.012);

rAttenuation ⇒ `number`

Calculate the real attenuation

Returns: number - 100 x (1 - (real extract / °Pi)
See: hbd.org/ensmingr

Param	Type	Description
og	`number`	original gravity (og)
fg	`number`	final gravity (fg)

Example

// return 68.9
rAttenuation(1.088, 1.012);

aau ⇒ `number`

Calculate Alpha Acid Units

Returns: number - weight x Alpha Acid Percentage
Todo

Add imperial unit option (grams)

Param	Type	Description
weight	`number`	weight of hops (in oz)
aa	`number`	Alpha Acidic percentage

Example

// returns 18
aau(1.5, 12);

utilization ⇒ `number`

Hop Utilization (Tinseth)

Returns: number - utilization = bigness factor x boil time factor
See: realbeer.com
Todo

Add rager scale option

Param	Type	Description
time	`number`	time left in boil (minutes)
gravity	`number`	Specific gravity (sg) of pre-boil wort

Example

// returns 0.2348476097710606
utilization(60, 1.048);

ibu ⇒ `number`

Calculate IBU for hop addition (Tinseth / pellets)

Returns: number - (aau x utilization x 74.89) / volume
See: howtobrew.com/
Todo

allow for grams for hops
allow for liter for volume
allow for rager scale
allow for whole hops

Param	Type	Description
weight	`number`	Weight of hops (oz)
aa	`number`	Alpha acids percentage of hops
time	`number`	time left in boil (minutes)
gravity	`number`	Specific Gravity of wort (pre-boil)
volume	`number`	post boil volume (gallons)
adjust	`number`	percentage to adjust hop utilization

Example

// returns 63.3
ibu(1.5, 12, 60, 1.048, 5.5);

srm2lovibond ⇒ `number`

SRM to Lovibond

Returns: number - Lovibond = (SRM + 0.76) / 1.3546
See: https://en.wikipedia.org/wiki/Standard_Reference_Method

Param	Type	Description
srm	`number`	SRM # to be converted

Example

// return 6.5
srm2lovibond(8);

// return 22.7
srm2lovibond(30);

lovibond2srm ⇒ `number`

Lovibond to SRM

Returns: number - SRM = (1.3546 × lovibond) - 0.76
See: https://en.wikipedia.org/wiki/Standard_Reference_Method

Param	Type	Description
srm	`number`	Lovibond # to be converted

Example

// return 8.7
lovibond2srm(7);

// return 30.4
lovibond2srm(23);

mcu ⇒ `number`

Calculate Malt Color Units

Returns: number - (weight * lovibond) / volume
Todo

support kg for weight
support liter for volume

Param	Type	Description
weight	`number`	weight of grain/fermentable (in lb)
lovibond	`number`	color of grains in lovibond
volume	`number`	batch size (in gallons) including deadspace/trub loss

Example

// return 5.727
mcu(9, 3.5, 5.5);

srm. ⇒ `number`

Calculates color (SRM) of eer using standard reference method (Morey equation)

Returns: number - 1.4922 x (MCU ^ 0.6859)

Param	Type	Description
...mcuNum	`number`	MCU units to covert to SRM. Accepts infinite # of arguments.

Example

// returns 4.9
srm(5.72);

// returns 6.4
srm(5.72, 2.54);

sg2gp ⇒ `number`

Convert specific gravity (sg) to gravity points.

Returns: number - (sg - 1) x 1000

Param	Type	Description
sg	`number`	The specific gravity (sg)

Example

// return 88
sg2gp(1.088);

gp2sg ⇒ `number`

Convert gravity points to specific gravity (sg)

Returns: number - (gravity points / 1000) + 1

Param	Type	Description
gp	`number`	Gravitiy points

Example

// return 1.088
gp2sg(88);

dilute ⇒ `number`

Calculate new SG when wort is diluted

Returns: number - (returns SG) GP = (Initial Volume * initial GP) / New Total Volume

Param	Type	Description
sg	`number`	Specific Gravity of pre-diluted wort
volume	`number`	initial volume
volumeAdd	`number`	Volume of water to add

Example

// return 1.046
dilute(1.054, 6, 1);

adjustWater ⇒ `number`

Calculate water needed to reach target gravity.

Returns: number - (volume x sg / target gravity points) - volume
Todo

support liters for input volume
support liters for return

Param	Type	Description
sg	`number`	Current/Specific gravity (sg)
tg	`number`	Target gravity
volume	`number`	current volume (gallons)

Example

// return .64
adjustWater(1.088, 1.078, 5);

adjustExtract ⇒ `number`

Calculate how much extract (in lb) is needed to reach target gravity.

Returns: number - lb = (target gravity - sg) x volume / extract gravity points
Todo

support liters for input volume.
support kilograms for output volume

Param	Type	Description
sg	`number`	Current / specific gravity (sg)
tg	`number`	target gravity
volume	`number`	volume (gallons)
extract	`string` \| `number`	'DME', 'LME', or custom gravity point value.

Example

// return 1.39
adjustExtract(1.078, 1.088, 5, 'LME');

// return 1.14
adjustExtract(1.078, 1.088, 5, 'DME');

// return 1.14
adjustExtract(1.078, 1.088, 5, 46);

evapLossPerHour ⇒ `number`

Calculate how much volume (gallons) is lost per hour to evaperation

Returns: number - volume x (percentage lost per hour / 100)
Todo

option for input volume to be liters
option for output volume to be liters

Param	Type	Default	Description
volume	`number`		pre-boil volume (gallons)
ratePerHour	`number`		percentage or voluem lost per hour
[rateMeasurement]	`string`	`"percentage"`	set rate measurement to 'percentage' or 'volume'

Example

// return 0.60
evapPerHour(6, 10);

// return 0.60
evapPerHour(6, 10, 'percentage');

// return 0.50
evapPerHour(6, .5, 'volume');

totalBoilLoss ⇒ `number`

Calculate total volume (gallons) lost during boil to evaperation

Returns: number - evapLossPerHour x (boilTime / 60)
Todo

support volume input in liters
support volume output in liters

Param	Type	Description
lossPerHour	`number`	amount of volume (in lb) lost per hour to evaperation
boilTime	`number`	length of boil (in minutes)

Example

// return 0.90
totalBoilLoss(.60, 90);

shrinkage ⇒ `number`

Volume lost after wort cools (in gallons)

Returns: number - volume x (percentage/100)
Todo

support input volume in liters
support return volume in liters
support boilLoss in liters

Param	Type	Default	Description
volume	`number`		pre-boil volume (gallons)
boilLoss	`number`		Amount of volume (gallons) lost to boil.
[percentage]	`number`	`4`	percentage the wort shrinks due to cooling

Example

// return 0.24
shrinkage(7, 0.90);

// return 0.15
shrinkage(7, 0.90, 3);

postBoilVolume ⇒ `number`

Calculate post boil volume (gallons)

Returns: number - start_volume - (boil_loss + shrink_loss)
Todo

support input startVal in liters
support input boilLoss in liters
support input shrinkLoss in liters
support return value in liters

Param	Type	Description
startVol	`number`	Starting volume pre-boil (gallons)
boilLoss	`number`	volume loss to boil (gallons)
shrinkLoss	`number`	volume loss to shrinking during cooling (gallons)

Example

// return 6.86
postBoilVolume(7, 0.90, 0.24)

postBoilGravity ⇒ `number`

Calculate post boil gravity.

Returns: number - (starting_volume x gravity_points) / final_volume
Todo

support starting volume in liters
support final volume in liters

Param	Type	Description
startVol	`number`	Starting volume (gallons)
sg	`number`	starting gravity (sg)
finalVol	`number`	Final volume (gallons)

Example

// return 1.072
postBoilGravity(7, 1.059, 5.71)

estimateOriginalGravity ⇒ `number`

Estimate Original Gravity

Returns: number - (gravityPoints * efficiency) / volume
Todo

support liters

Param	Type	Description
gravityPoints	`number`	Total gravity points of fermentables
sugarPoints	`number`	Total gravity points from sugars (dextrose, etc)
efficiency	`number`	(mash or brewhouse)
vol	`number`	into fermentor (if brewhouse eff) or pre-boil vol (if mash eff)

Example

// return 1.061
estimateOriginalGravity(429, 46, 75, 6)

estimateFinalGravity ⇒ `number`

Estimate Final Gravity Points

Returns: number - Final GP = (1 - (attenuation)) * gravityPoints
Todo

allow to adjust center temp & slope %

Param	Type	Description
attenuation	`number`	Attenuiation % from yeast
gravityPoints	`number`	Gravity points
rounded	`bool`	if return value should be rounded (optional)

Example

// return 13.5
estimateFinalGravity(75, 54)

// return 14
estimateFinalGravity(75, 54, true)

estimateFinalGravity ⇒ `number`

Estimate Final Gravity (adjusted for simple sugars & mash temp)

Returns: number - FG = (1 - (attenuation x .01)) * GP

Param	Type	Description
grainPoints	`number`	Total gravity points from grains (exclude sugars like dextrose)
sugarPoints	`number`	Total gravity points from sugars (dextrose, etc)
attenuation	`number`	% from yeast
mashTemp	`number`	(optional)

Example

// return 1.061
estimateFinalGravity(54, 17, 75, 154)

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build		build
test		test
.babelrc		.babelrc
.eslintrc		.eslintrc
.gitignore		.gitignore
README.hbs		README.hbs
README.md		README.md
index.js		index.js
package.json		package.json

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DapperCalc

TODO

Modules

sg2plato ⇒ number

plato2sg ⇒ number

originalExtract ⇒ number

apparentExtract ⇒ number

attenuationCoefficient ⇒ number

realExtract ⇒ number

abw ⇒ number

abv ⇒ number

caloriesAlcohol ⇒ number

caloriesCarbs ⇒ number

caloriesTotal ⇒ number

aAttenuation ⇒ number

rAttenuation ⇒ number

aau ⇒ number

utilization ⇒ number

ibu ⇒ number

srm2lovibond ⇒ number

lovibond2srm ⇒ number

mcu ⇒ number

srm. ⇒ number

sg2gp ⇒ number

gp2sg ⇒ number

dilute ⇒ number

adjustWater ⇒ number

adjustExtract ⇒ number

evapLossPerHour ⇒ number

totalBoilLoss ⇒ number

shrinkage ⇒ number

postBoilVolume ⇒ number

postBoilGravity ⇒ number

estimateOriginalGravity ⇒ number

estimateFinalGravity ⇒ number

estimateFinalGravity ⇒ number

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sg2plato ⇒ `number`

plato2sg ⇒ `number`

originalExtract ⇒ `number`

apparentExtract ⇒ `number`

attenuationCoefficient ⇒ `number`

realExtract ⇒ `number`

abw ⇒ `number`

abv ⇒ `number`

caloriesAlcohol ⇒ `number`

caloriesCarbs ⇒ `number`

caloriesTotal ⇒ `number`

aAttenuation ⇒ `number`

rAttenuation ⇒ `number`

aau ⇒ `number`

utilization ⇒ `number`

ibu ⇒ `number`

srm2lovibond ⇒ `number`

lovibond2srm ⇒ `number`

mcu ⇒ `number`

srm. ⇒ `number`

sg2gp ⇒ `number`

gp2sg ⇒ `number`

dilute ⇒ `number`

adjustWater ⇒ `number`

adjustExtract ⇒ `number`

evapLossPerHour ⇒ `number`

totalBoilLoss ⇒ `number`

shrinkage ⇒ `number`

postBoilVolume ⇒ `number`

postBoilGravity ⇒ `number`

estimateOriginalGravity ⇒ `number`

estimateFinalGravity ⇒ `number`

estimateFinalGravity ⇒ `number`